Thread gauge



Aug. 2i, 923. 1,465,583

A. F. MILEY THREAD GAUGE Filed nec. 9, 1919 2 sheets-she'et l 45 each for Vengagement in the grooves between Ill) latenteezlng. 21, i923.

Anno r. Minnmcr Vron'rrnc,y raroHrs-nn.fy

l manen GAUGE.

Applicaties area December. e, 191s. seran recesses;

To all cli/710m t concern.' v

Be it known that I, VJinno F. Minn-f, a citizen of thellnited States, tiac,fin theV county ot' Qakland andqState of liltichigan, have invented certain'jiiew and useful Improvements in Thread Gauges, of which the following is a specification.

This invention relates to improvements in measuring instruments of the type vpri-V Vmarily designed for gauging and testing the pitch or leadfof screw threads. Y t

Among the principal obgects contemplate by the present'invention arezto provide means for automatically gauging? testing` and visibly indicating withA absolute accuracy the pitch or clead of screw threaded parts of any type; to provide means foreflfecting necessary adjustments in the operating parts of the instrument; to automatically return the gaugin'g'and indicating` elements of the instrument `to zero upon the completion of a test; and to compensate for possible vibration or wavering' of the indicator needle to eit'ect quick and accurate tests.` e

Furthermore the invention for Yautomatically translating yirregular movement of the thread engaging parts as resultant from application to screw threads of various -pitches intoY uniform movement of a visible indicator operative upon a reguadjacent screw threads to ymove the actuating rod with respect tothe casing to indirectly measure or gauge the distance lbetween the axes of :consecutive threads; compensating mechanism being provided in the connection between the actuating rodand pointer "for translating the irregular movement of the rod into uniform movement of the pointer. These elements and other 'features are illustra-ted in detail in the acompanying drawr-esiding; at.. Pon? provides means ings and hereinafter described 'andclaimed- Figure l is a side elevation ofthe assembly ot l,the device in loperation upon a screw threaded part.

Figure' 2 is aisectional-side elevation of"` the device without-the interposition of a@ compensator. v f I `Figure .3 lis a section on the line 3*-.3 of Figure' 1. .Y Y

Figure e is a detail of the connection between the operating rod and indicator actuating mechanism.

Figure 6 isa cross-section of theoperating Y rod taken on the line 6-6 of Fig. 2.

Figure `5 is a section on the line55rof Figure?- is awcrosssection (slightly enlarged) taken on linev 7-7.of -FigQfQj l Figure Sis a graphic analysis'of the `dial face.A 1

Figure 9 .is a 'graphic analysis of the man- :3

ner yof translating longitudinalfrnovement ofthe operating rod to-a'irotar'y indicator. Y Figure l0' is 'a detail' showing twoassociated small:measuringpointsr Figurel ll is a rfragmentary operating rodjadjusting mechanism and ad- `justing mechani mfor one ofthe largemeas.- uring pointsf J g n I Figure l2 is ai sectional side` elevation of .one form oit-compensation. i'

Figure' 13 isa sectional sid'eelevation of anotherfformof compensation.. 'i

' Y Figure le is a detail View of the'bisected double segment cam gearY compensator used inthe modication illustrated in-iFlgure 12, f

and c .Y

Figure l5k is a perspective detail oflthesemi-spiral Vcompensator. apparatus' used in the ymodification'illustrated in `Figure i3.

In-the drawings 'wherein like characters f of reference indicate like or'similar parts throughout the several views, I have generally designated'the operating mechanism by the letterA andthe indicating mecha` detail of the "12.2. l

nism by thel letter VfB for the sake of'. ditfer-v entiating between the two and for clarifying the description of lthe'same. I -K The operatingmechanism A of the instru.-` ment comprises an elongated cylindrical actuating rod 1' havingwa reduced terminal portion 2, a 'portion of which isV embraced by a coil springgwhose ends abut the. shoulder formed bythe reduced portion 2 of: the acV tuating rod and the shoulder forme-d by a reduced' terminal portion: 4L cfa cylindrical elongatedoasing rwvrithin which-the aetuatover and about which is mountediir anyr suitable manner beingV made integral or otherwise the housingu ol' the indicating Vmechanism B hereinafter referred to and is fprovidedavith" screw threads ad]acent the "reducedportion l-orf receivinga protecting` .the casing opposite the reducer cap 7. iii: setI nut @screwed into'the end of l `iortion operatesl upon the-end yot' the aetuetingrrod 1 to adjustY the normal position the rod Y lWithin the casing against the pressureot the casing,r 5

coiled'spring 3.A l

TheV actuating rod 1 isV provided-with ven tiealdevetailed er arcuate `grooves 9El adjacent each orn itsA ends Within which are adjustably mounted a large measuring point lOf andv a relatively` smaller meas uring point 11, eaeh oiC which entend through longitudinal slots 12 formed in the as'illustrated. ln. order that the measuring-point 10 may be positively adjusted the shank l'thereotl mav be .termed triangularlyas illustrated ingificcu (G) and cut out to form asemi-cylindrical recess 14C registering with aseini-cylindrical longitudinal groove 15 in the end'orn Vthe actuating rodv 1l and a4 screwv` threadedaadjustinp; pin

A16: (Rigi 11;) having a cylindrical head1:7

operating inthe groovel and engaging' in :the recess: 14 is,carried in a; stem 181mounted 'but may be. made'A so it found desirable.

VMeasuring points,--192.and 20- (the latter of whichzis `the smaller), eoact with pointsl() and 11g respectivelyy and have curved .clasping portions 21 which embrace the casing andthe lar-ger of which is secured thereto by a, set` screwy `22 operating in a slot 23 provided initheg'fcnrved'portion 21 tor permittingI adjustment'y otvr the measuring; point when desired. As shown in Figs. Gand-7Y the Ineasuringpoints-lQ and 2O'on1the casing` extend downwardly to. lie' against theA registe ing pointsflO and'll on the actuatingrodgl.y so thatiupon movement otfeither of Athe measurin-gpoints on therod-il relative tot the. measuring points on fthecasing 5` @corresponding movement will be 'elected'of the rodwvithv respect to the. casing@ and in v order to; translate this longitudinal movement to circular movement of; the. indicating mechanism a wrist: pinf generally designated byi 24 is mounted transverse-ly; ofitherodil in an elongated sletY 25 formed in agfreduced, portion A26 midwaythe extremities-thereorn andis engaged betvveenzthe bifureations 2? ota lever 28 mounted on the end-of a. Vstub shart 29 carried. by the bracket SOsecured to the baclr y plate 31 of the indicating mechaof the nism B.

thas been found desirable to provide the Wrist pin 24 with aA suitable roller bearing 2to eliminateffriotional resistance andl this bearing may be of any desired type. Fur,-V thermore attention is; called to the tact that the wrist pinlmaybe adjusted with respect to the rod 1 by moving it in the slot 25.

The indicatingmechanisinvB, per se7 in! cludes a pointer 32. pivotedthrough plate 31." and to the bracket 83 on the plate 31y andi carrying a cog 3e:A Which is engaged by an arcuateraok bar,y anounted'on an arm 36'pivoted to thepin 29 'on the plate 31 so .that upon swingingzof thelever 28 resultant from movement of the rod 1` the cog` SLi-Will be rotated andthe pointer turned to indicate upon .the graduated dial tace the degree Y of movement of the rod. ln order to prevent vibrationofL the pointerr32 and to steady the entire indicating'm'echanisina spring 37, one, end of which engages a pin 3&3A carriedby` the bracket 39 secured to the face ofl the dial plate 31,1has its otherA end secured to a shaft 40 Which carries: a gear il intergearing.. with thecogl 84 as shown and operating in amanner Whichisrobvious;v

Ags-illustrated; in Figure 7 the measuring point 11 may be formed triangular in cross# section and providedwith a socket 4K2 for receiving the terminalend of' the curved clasping portion of the measuring;4 point 2O which also is@ formed triangular `in cross-section. Infact many modifications of the measuringipoints arepossible andthe present forms areshovvn ,merelyvby Way oti'illustration.V

Inoperationithe rodi 1 is, adjusted with respectto. the casingvrby tur-ning theset nut 8: softhaty the measuringipoints 10 andV 19 f spaced and numbered to conform to the sizes of standard threads indicatedby thepointer. Upon releasing` the measuring points from the thread the rodwill be returned towits normali` position; through the pressure exf ertedbythecoilspring desirs-obvious.- The smallvrneasuring)` points 11, and 2Or are ordi# narily` enclosed and; protected f by the cap- `7, but: When very fine` threads or those in a verysmall nutare to Abe measured the oapis removed and the instrument operated the vthe rod into uniform man-'ner'before stated. VAttention is called to theV fact that any variation between the actuating rod 1 and casing 5 may beadjusted by the set nut 8, between ythe measuring pointsV by the set screw 22; andbetween the rod-1Y and indicating mechanism by moving the wrist `pin 24 in the slot 25. Furthermoreattention is also invited to `the function of the steadying spring 37 which prevents vibration and swinging of the pointer 32 and facilitatesv making quick and 'accurate tests. i f 1 As direct translation of the movement'of the actuating rod to the indicator mecha` iismr necessitates the utilizationv of ununi-I K ferred to. and with whichis intergeared the pinion 43 of a double gear type, the largery gear 44 of which is inter-geared with'a gear wheel 45v carrying a i semi-spiral arm 4G grooved to provide a track 47 for-receivinga thread 48 secured thereto as at 49'. The opposite end of the thread 4S is secured to and operates in a track in a similar, but reversed semi-spiral arm 50 carried by the cog 34 ot the pointer, so that upon rearward movemen-t of the acctuating rod l'the Vsemi-spiral arm 46 will be moved to wind the thread 48 in the track 47 and unwind it from the track in the semi-spiral arm 50 thus rotating the pointer, but compensating for thel irregular movement of the rod, upon forward movement of the acctuating rod the opposite action of the thread will take place on account of the tension of the spring 37 as 'operatingr upon the cog 34 in the manner before described. Y

rIhe 'other form of compensator illustrated in Figures 12 and 14 embodies the disposition of a bisected double segment cam gear 51 having secured to each of itselements a and cogs 52 and 53 respectively, intergearing-with the gear Ywheel 45 and cog 34. In

this instance upon rotation or the gear` wheel 45 the element c of the double segment gear 51 will 'be rotated by the cog 52 in the direction of the arrow and as its teeth mesh as at X with the element b the gear 53 will be rotated to actuate the-cog 34 and consequently the pointer 32, which however will have a regular movement over the dial on account of the compensating action of the cam gear 51.

rlhe graphic analysis illustrated in Figures 3S and Sfindicates the manner in .which irregular (uncompensated) graduations areV ascertained for placement upon Vvthe dial tace 31" to ltranslate the movement ofthe rod 1.5

In thev graphic illustrated in Figurel 8' lines m indicate thirty second graduations or an 1 inch and lines n the progress of thefrodl upony application toscrewV threads of differ-V Y ent standard sizes. In Figure 9 these graduations are shown as'beingtranslated to the circumference o'fafcircle O (the periph ry of aodial) having a center Z.- indicate standard sizes of threads ranging from4to 32. n. l

It will-now be apparentv that LI have devised a novely and useful construction of athread gauge: lfor screw threaded parts, which embodies the "featureso advantage enumerated as desirable in the :statement ot the invention'kand the above description, and-whileA I have, inthe; present instance.

*TheV igures shown and' described preferred .embodimentsA thereof which .have been "found *inV practico to giveY satisfactory and reliable results, it is toV be .understood thatthe same are susceptible oi modification in various particularswithout departing'from the spirit or scope of'theinvention as claimed-or sacri'- Y 'icin'g any or, its advantages.

V1. Anthread gauge 'comprisingyan indi-V cator, a movablev actuatingmember connectedwiththe indicator, a casing forthe-actuating member, means respectively on the actuating member and casing for straddling' a screw thread and moving the'factuating member for. ascertaining itspitch, and means located between and connected withthe actuating member'f and the indicator for converting the irregular movement of the actuating member into a regular movement of the indicator;

2. A thread gauge` comprising an. indicator, a movable actuating member connected with the indicator., avc'asing Vfor theI actuating member, adjustable means respectively on the actuating member-aand casing for straddling a screw threadand moving the actuating-member for ascertaining the-pitch l of saidthread, means for translating the movement of the'actuatingmember to the indicator and converting Yit from irregular to regular movement, Yand means for returning the actuating member'to initial position after'the testhas'been completed.

3. A thread gauge comprising an indicator, a movable actuating member for theY indicator, a casing for theY actuating member, means respectively on the actuating member and casing for straddling a screw thread and moving the actuating member for ascertainingthe pitch oi Vthe screw thread, means between the actuating member and the indicator for translating the movement or the actuating member to the indicator and converting it ,from Virregular to; regula-r movement, and meu-ns for preventing Vibrae tion ofthe' indica-tor. s

4. ifi thread gauge; comprising, indi:- cator," u mora-ble nctuzitingjrodin casingffor the actuating`l rod, ineens reispectivelylonl-the actuating rod and casing" igor streddlinga screw thread and movingthe actuatingrod with respect t0 the casing "for :iscer-tzrining;V

the other, ineens for protecting thesnialler measuring points when not infuse' a coil spring embracing a4 portionof the actuating rod and ahuttingfthecasing; for returning the actuating rod to its ze-rcfposition', Ineens for adjusting the ectuatingrodwith respect to the casing7V and meansV connected to the actuating rod and to theiindicator* fort-rens lsrtingy the longitudinal movement of the aotuntingrodv into-circular ymove-ment 'ofi the indicator.

6I. A threadgauge 'coin'prising-fafidiafl i plate, fr pointer pivottnlly; mounted to rotetewover the diailtl pleite,- reciprocatory ineens for: actuatin the pointer, springy operative With the actuatii @j pointer, pitchdetermining means for stradh dling; a screiv threadI and operatively connected with the actuating means ionl the pointer, ineens for tinnslating andflv convert the reciprocatoizy movement; o the streddling means into-rotary movemenft'with the pointer, ineens whereby the means 'for strade (lling aA screw thread inaygbeadjusted,v and ineens for returning' the screw thread strade nieans fori steadyingv the dlingmeuns tenero position after beingy yre -fmovedifroin the :screwl thread.l y

7. A thread gauge, comprisingA an indi-V cator, a tubular casing having una opening in one side I Weill @here "which sind indicator is inouirtedzav rod slidzible: longitudinally in said casing, a coiledspringfinounted-to holdl said rodV at zero position in-th'e casingelset nut mounted in oneendfof saidlcasing-toi enL gege seid rod and project it. against the-1 tensionoi seid spring, pitch deterniiningineans 'for streddling e screw threadv and mounted respectfully on the casing'andon said rod,

and ineens located between. and connected Withv seid rod and indicator- Whereby the movement of the rod is trunsletedto-theindicator; :indA the forinly; Y

In testimony whereof, .I affix my signature hereto.

latteny cimmedV to movey uni- Annone. Minet.'v 

